已知三棱锥的体积为
,
,
,
,则二面角
的大小为
23-24高二上·辽宁大连·阶段练习 查看更多[2]
更新时间:2023-10-11 07:10:05
|
相似题推荐
填空题-单空题
|
较难
(0.4)
名校
解题方法
【推荐1】四棱锥
中,底面
是边长为
的正方形,侧面
是以
为斜边的等腰直角三角形,若
,则四棱锥
的体积取值范围为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/411b38a18046fea8e9fab1f9f9b80a5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/61128ab996360a038e6e64d82fcba004.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d923a338dd2d2e29336b42574d38448.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/defa5b53043ae802bb1af7d14374406d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0fe1ff81d3b7f3f82cb7e247aa2045a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/faeb97acf19bd3b2c6c77c2814df4d2f.png)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
【推荐2】已知球的表面积为
,三棱锥
的顶点都在该球面上,则三棱锥体积的最大值为
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
解题方法
【推荐1】一个四面体有一条棱长为
,其余五条棱长均为3,该四面体的外接球半径为__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/834a3ea87bf5602618ad136bddc04ab6.png)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
解题方法
【推荐2】将四棱锥
沿棱展开为平面图形,如图所示.若
,
,
,
,
,
,则在展开图中,
两点之间的距离![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9214112843303e45a4d9dc20507ed1.png)
__________ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0585b6c0f156eecf9662b9846d4eb693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5e07a099bf87e471b94bc97f0249daf7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/074a5b4d376ae0d7648d97b79be0b65d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0d829c51c819076d094facd9dffe2c8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4b7efcc776e3479d01484cd468c6894.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1fa5088fedf996af3d7c50a39bdaae73.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be94b5ac27724cd0e43541759203784e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0698ef3a8f862a82245d97691eba628f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ff9214112843303e45a4d9dc20507ed1.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2024/2/24/c6cb2c6f-7ab3-445d-8449-1c3850cd7f7f.png?resizew=171)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
解题方法
【推荐1】如图,在正方体
中,点
在线段
上运动,有下列判断:
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/2b393892-616b-4b18-948c-e236b1db6cc0.png?resizew=170)
①平面
平面
;
②
平面![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
③异面直线
与
所成角的取值范围是
;
④三棱锥
的体积不变.
其中,正确的是__________ (把所有正确判断的序号都填上).
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6e09725691ee7851f54c0dee86b2bf55.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/dad2a36927223bd70f426ba06aea4b45.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0d8772aa893a9c1d40f714cb25701701.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/3/20/2b393892-616b-4b18-948c-e236b1db6cc0.png?resizew=170)
①平面
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bc954f644ebd405a780856f8c02cfe66.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
②
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e1c823e54bf3a3a7f1916a4886eb6279.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da7977ab975efa6411cc17de39be70d9.png)
③异面直线
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d0ff310aabd2282b539537ebed3f788.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/83c09eec4e14a861af83d7828797d176.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/05301d54b4ab7e88e9382bfe23ccea75.png)
④三棱锥
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b23e623d7180e345393af2fcde4e9c2b.png)
其中,正确的是
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
解题方法
【推荐2】如图,在棱长为1的正四面体ABCD中,M,N分别为棱AB和CD的中点,一个平面分别与棱BC,BD,AD,AC交于E,F,G,H,且MN⊥平面EFGH.给出下列六个结论:①AC⊥BD,②AB//平面EFGH,③平面ABC⊥平面EFGH,④四边形EFGH的周长为定值;⑤四边形EFGH的面积有最大值;⑥四边形EFGH一定是矩形,其中,所有正确结论的序号是_____ .
![](https://img.xkw.com/dksih/QBM/2020/3/4/2412271471992832/2412893459046400/STEM/bae9fbfc-1d7d-46fc-a44e-564914be8922.png)
您最近一年使用:0次
填空题-双空题
|
较难
(0.4)
名校
【推荐1】如图,D,E,F分别是边长为4的正三角形三边
的中点,将
,
,
分别沿
向上翻折至与平面
均成直二面角,得到几何体
.则二面角
的余弦值为_____ ;几何体
的外接球表面积为_____ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3f19920ccc59d415fbfb64b88747c1c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a25c28359f8d8da9eaf4672a6cf8ae4f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5f2ea13010e2399194be2a681310543e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ebdda64e2dd89a47e4f4e137c229607c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c8f4e6e7ba63c154a64ea0e0a63359d5.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/134ef0b1a2669a09f05bd4dc2496f706.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f253eece04f2d23e3fdc338f694ffd5c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/986ba572d8373df48c996f8c8611498c.png)
您最近一年使用:0次
填空题-单空题
|
较难
(0.4)
名校
【推荐2】在三棱锥
中,
,且
,则二面角
的余弦值的最小值为______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63397cda22cb1fad59cf966dfb588643.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e08c842ba3416d69614a5ffa877f905c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/982bb2f1368b348e0197f04f88f41740.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/47d294d69caac577339f11f477b2047e.png)
您最近一年使用:0次